I've started my Italian lessons on my Mac laptop and want also to use my iPhone. But when I download the phone app, it wants me to start lessons from scratch again. How can I set things up so that I can switch from one to the other with my progress recorded on both?
Use the same username and password on your iPhone as you do on the PC.
Also be sure that on your phone you're clicking a button that says something like "I already have an account" and not one that says something like "Get Started".
On the iOS app it has changed (again) and to login go to the profile tab (middle tab on bottom of screen) and then select Settings (top right of screen) and then scroll up until you see “sign in”
It’s just another example that some Duo programmers do not understand usability issues.